<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../js/vue.js"></script>
  <style>
    .classA{
        color: red;
    }
  </style>
</head>
<body>
  <div id="app">
      <div v-bind:class="{'classA':isRed}">我是v-bind指令,绑定class属性</div>
      <div v-bind:style="{fontSize:size + 'px'}">我是v-bind指令,绑定style属性</div>
  </div>
<br>
  <script>
    var vm = new Vue({
      el:"#app",
      data:{
           isRed:true,
           size:20
       }
     })
   </script>
</body>
</html>